As for Reina, when she dropped into her area which was hard to form any sort of surface, she made the same choice as Ash and began to terraform the place using Ice to Stone.
However, the entire area was like this so even if she created a living space, it would be influenced by the slush all around that was constantly moving. As such, she wisely decided to evaluate the land she was building upon and produce something akin to houses in the air that were supported by pillars.
She then melted the ice around the land she chose and turned it into water. Along with her wood element, she created a lot of vines and tough plant life that could survive in these harsh conditions.
She wanted to see more life around her, so this was her goal.
